[Uri’el-2012]

there is tons of evidence that the earliest Christians celebrated the 8th day, the day of the ressurection AS WELL as the sabbath day which is why in Christian nations like Russia Saturday is Subbota (sabbath day!) and sunday is voskresenie (The Lord’s day)

75 posted on 06/19/2007 6:11:22 AM MDT by kawaii

I believe the origin is the early falling away:

Council of Laodicea circa 364 CE ordered that religious observances were to be conducted on Sunday, not Saturday. Sunday became the new Sabbath. They ruled: "Christians shall not Judaize and be idle on Saturday, but shall work on that day."

[Uri’el-2012]

This is the Decree from the first Pontiff of the Roman church to all the world.

Emperor Constantine, Emperor of the Roman Empire

He had issued an Edict making Sunday the day of rest

In 321 CE, while a Pagan sun-worshiper, the Emperor Constantine
declared that Sunday was to be a day of rest throughout the Roman Empire:

"On the venerable day of the Sun let the magistrates and people residing in cities rest,
and let all workshops be closed. In the country however persons engaged in agriculture
may freely and lawfully continue their pursuits because it often happens that another day
is not suitable for gain-sowing or vine planting; lest by neglecting the proper moment
for such operations the bounty of heaven should be lost."

b'shem Yah'shua

[kawaii]

Indeed Christians worship the Lord on the 8th day, the day of the resurections however the council you mention, which is a local council not binding on the whole church, is notable in that it commanded the gospels be read on Saturdays.